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Here is a standalone compilation of all of the Roads and Bridges from Colonial Charter.
Because this is standalone from Colonial Charter, you don't have any way to make Bricks or Lumber, which some of these would normally use. So I slightly modified them to use Stone and Logs instead. So you need Stone to build a Brick Bridge.
Brick Road
Red Brick Road
Gravel Road
Soil Road
Quay Road
Moss Road
Sandstone Road
Country Road
Dock Road
Stone and Wood Bridge
Stone Bridge Split
Stone Bridge
Draw Bridge
Brick and Wood Bridge
Brick Bridge
Creek Plank Bridge
Rock Bridge
Dock Bridge
Covered Bridge
Old Creek Bridge
Alternate Download Link From Google Drive

I would like to make a suggestion, where bridges are only build from one side, as of now, builders always build from both foundation points. On some maps, for example, Lake Waters, the main river can divide the map completely, making the other side unreachable, so the bridge never gets built.
See problem below in picture: